Trouble detector for messenger call circuits



\ .mw 5 7 o R s, m am W M0 6, w @rm ,1, `.I w u n.. c .L n oww SMS. mm2 JMWv .RJ ww,w Gnu ww. E T E D E L B U 0 R T Jan. s," 1929.

office.

.Patented Jan. 8, 1,929.

l UNITED "STATES PATENT eFH-CE..

k@Ronan w. .mnsonor NUTLEYy-NEW .rERsExAssreNon zro'rnn WESTERN Union` I 'rELnGnArn-comrnnxor NEW-YORK, N. Y., A CORPORATION on NEW Yoan.

TROUBLE vDETECTOR FOR MESSENGER 'CALL CIRCUITS.

AApplication inedV June r2s,

My invention relates to electric 4 signaling systems land particularly to the equipment at the central stationv which is connected with the various outlying branch offices.`

Each branch oflice ,is-provided With a recording instrument and With audible signal devices for, receiving the signals or calls transmitted from the call-boxes in the messenger call circuit which terminatesat `that Such call circuits are Well known and are clearly described in ypatent tol Hamblin No. 808,451. It is important that the service upon all of the'messenger call oircuits vshould be maintained Without interruption `and that anyline trouble should be known instantly at't-he ymain or central office. It is also important to maintainl 4the entire lsystem in condition to receive signals from the-boxesin any of the branch circuits during the entire "twenty-four hours.

The object of my invention is to provide an Aarrangement of' circuits and 'fan `equipment Which Will indicate to the `central office attendant the existence of vany open or ground fault von the vcorulu'ctor connecting the central office switchboard-to kan outlying branch office, 'together with means for recording signals.y which Iare 'sent Afrom lany* call-box during Lthe continuance of the trouble on that line.

Another object `offmy invention y-is to provide an arrangement lwhich will automatically transfer the record of incoming calls be arranged substantially lin the manner shown in the Hamblin patent. I connect a circuit closer 4, which may be the armature of a relay magnet 6, or other signal responsive device, at the central office in circuit with a conductor 5, connected to a grounded source G.

At the central office the conductors 5 are connected respectively to relays 7, having one coil a. connected to a line 8 leading to vUnder normal conditions,-'With theswitch'es 192s. sr'iai No. 119,186.

' those of the line 8 and the apparatus con# nected thereto, approximating the relation yof .the Vnumber of turns or, coils oncoil ,b to" the number of'turns on coil a. y

At the branch offices the lines 8, terminate in an audible signalv device, such as a single tap bell 10, and a record-ing apparatus 12.

14 at-the branch `office closed, the signals sent in the call boXes 3 larefrepeated by' the relay magnets 6 and transmitted through the lines 5 and '8, leading'to the branch loffice,

being recorded by the recbrding apparatus 12 v'at -said branch office. EInas'much as the currentsbranch throughthe-coils a and I)l ofI the lrela at the central office, in the inverse ratio of 'the turns on these coils, vvthe magnetic effects are balanced "and the armatures are unaffected.

l If now trouble develops in oneoftheilines 8 vleading' from the central ofiicelto a branch office, the recorder will not respond to` any incoming signals. VAt fthe central office,how# ever, the magnetic effect of the coils aand fb .is unbalanced, since the ycharacteristics of the articiallline AL are no lon-gerv proper# tionate to those of the grounded or `open line. Consequently, any signals coming in on-the `line 5 Will cause corresponding movements ofthe armaturen-and the signals will thus be repeated over thefcorresponding conductor 15, energized from source G2 Lthereby -actua'ti-ng the Iappropriate -magnet of the annunciator 16 `and-*causing the call 'box signal to be recorded on "therecoroler 12 at` the central office. The -fattendantjat the central office is thus fapprised Aof the number roi' the call AfboX sending "the 'signal and the-pan ticular branch circuit is indicated "bythe drop on the annunciator and hence the attendant can dispatch a messenger to the calling party or else notify the attendant at the branch office by phone or telegraph. Hence the service is maintained and at the same time the central office is :made aware of the t-rouble on the Wireconnecting the central and branch offices.

Many branchl offices are openl only during certain business hours and yet signals are liable to be sent from subscribers call boxes during the remaining hours. My invention 2;-, and I do not limitv myselfV tothe particular provides for this contingency by automatically transferring the record of incoming calls from any branch oflice to the central oitice. Before closing the branch oice the' attendantV opens the switch 14, thereby opening the circuit 8 of his recorder, As previously explained, this imbalances4 the corresponding relay 7 at the central office and` the signals from all call-boxes in the messenger call-box circuit connected to that branch oftice Will be repeated by the relay and actu-.

atc the annunciator 1G and recorderlQC.

It will be apparentstliat my system issus- Ceptible of many variations andmodifications to adapt it 'for particular conditions,

details illustrated and described.

I claim:

l. In a signaling systeni,tlie combination with a central station Vand, one. or more `branch, stations, recording means at eachbranch station', circuits extending from said central station includingr one or more call boxes, line circuits connecting said recording means to the central station, auxiliary recording means'` at said central station, means at the central station to repeat the signals from said call boxes into the corresponding line circuits, and means operating to actuate said auxiliary recording Ameans from any call box circuit when the circuit of the corresponding branch station is defective.` y A 1 2. In a signallingsysteni, the combination of a` central station and a circuit having a plurality of make andbreak devices extending therefronrto a remote point, repeating means at said station responsive to signals from said` devices, a distant station and a line connecting said distant station to the central station, a recorder located at said dist-ant station and controlled by` of a central office and a plurality of call ciry cuits distant therefrom, each provided With a plurality of signal transmitters,signal responsive means located at the central oiiice `and included in saidv call circuits, branch oflices distant lfrom the central omce, recorder circuits corresponding to the respective call circuits connecting the branch offices with the central oice, circuit closing` means in said recorder circuits controlled by said responsive means, signal recorders in the circuits at each branch otlice, and a common recorder at the central oiiice, relays at the central oice connected in said recorder circuits and unresponsive Vto said signals when the signal recorders operate, and means controlled by said relays to cause said coininon recorder to respond to the transmitters in any call circuit upon the ,occurrence cfa changed condition in the corresponding recorder circuit which interferes Witli the operation 0f the corresponding recorder.

4, In a signalling system as set forth in claim 3, an annunciator at the central office having its indicator magnets connected respectively in circuits including the arma-V tures and contacts of said relays.

5. In a signalling system, a signal transmitting station having means `for transmitting signal impulses, a vsignal receiving station having `means for receiving said impulses, a central station remote from both of said stations and having signal receiving means thereat, a line connecting the transmitting station andthe central station and a line connecting the central station with theV receiving station, means attlie central station whereby signal impulses originating ct the transmitting station and transmitted over the first line are retransmitted tothe.

receiving station over the second line to actuate the receiving device thereat, and means at tlie'central station for rendering the receiver thereat unresponsive tothe signals transn'iittcd from the transmitting station while the second line is in condition tore-` transmit the signals.

In testimony whereof 1 affix my signature.

GEORGE W. JANSON.

ioo 

